Find Target (Su)

Once per day, an iron cobra's creator can order it to find and kill a
specific creature within 1 mile, which it does as if guided by discern location. The creator must have seen or be holding an item from the specified creature for this order to function.

Poison (Ex)

An iron cobra's bite injects poison from a hidden reservoir within its
body. Because it is a construct, the cobra does not naturally produce
this poison, and its creator must refill this reservoir manually. The
reservoir holds enough poison for 3 successful bite attacks, after
which the creature merely deals bite damage. Refilling the reservoir
takes 5 rounds and provokes attacks of opportunity. The creator can
fill the reservoir with any injury poison (typically black adder
venom), though acid, alchemical substances, and even stranger liquids
have been used.Black Adder Venom: Bite—injury; save Fort DC 11; frequency 1/round for 6 rounds; effect 1d2 Con damage; cure 1 save.

Construction

An iron cobra's body is built from 100 pounds of
magically treated materials (typically iron).

Variants

Iron is the most common material for
these creations, but some crafters prefer more exotic materials when
creating the serpentine
constructs.Adamantine Cobra (+1 CR): This cobra is more
solidly built than
others. Its natural armor bonus increases to +12, it gains +5 hp per
HD, and it gains DR 10/—.Cold Iron Cobra (+0 CR): This cobra’s natural attacks count as cold iron for the purpose of bypassing damage reduction.Darkwood Cobra (+0 CR): This cobra is more
mobile; it gains a
swim speed of 30 ft. and a climb speed of 20 ft.Mithral Cobra (+1 CR): This cobra is much
swifter. Its
Dexterity increases by +4 and its speed to 70 ft., and it can make 2
bite attacks per round as a full attack
action.

The
iron cobra is a simple construct that resembles a hooded cobra made out
of metal. The iron cobra is typically used as a bodyguard or guardian
of treasure, though its magical ability to unerringly locate creatures
means it is also used as an assassin. Since an iron cobra's poison
reservoir can contain multiple types of venom, the construct's specific
use can be further tailored by varying the poison used. Some
spellcasters even fill these reservoirs with potions, so that when the
cobra bites, it injects the potion into its target. This is a somewhat
dangerous method for gaining the effects of a potion, but it does free
up the cobra's master to do other things in a combat round apart from
quaffing potions.